/*
* This file is part of wl1271
*
* Copyright (C) 2008-2009 Nokia Corporation
*
* Contact: Luciano Coelho <luciano.coelho@nokia.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA
*
*/
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/crc7.h>
#include <linux/spi/spi.h>
#include "wl1271.h"
#include "wl12xx_80211.h"
#include "wl1271_spi.h"
static int wl1271_translate_reg_addr(struct wl1271 *wl, int addr)
{
return addr - wl->physical_reg_addr + wl->virtual_reg_addr;
}
static int wl1271_translate_mem_addr(struct wl1271 *wl, int addr)
{
return addr - wl->physical_mem_addr + wl->virtual_mem_addr;
}
void wl1271_spi_reset(struct wl1271 *wl)
{
u8 *cmd;
struct spi_transfer t;
struct spi_message m;
cmd = kzalloc(WSPI_INIT_CMD_LEN, GFP_KERNEL);
if (!cmd) {
wl1271_error("could not allocate cmd for spi reset");
return;
}
memset(&t, 0, sizeof(t));
spi_message_init(&m);
memset(cmd, 0xff, WSPI_INIT_CMD_LEN);
t.tx_buf = cmd;
t.len = WSPI_INIT_CMD_LEN;
spi_message_add_tail(&t, &m);
spi_sync(wl->spi, &m);
wl1271_dump(DEBUG_SPI, "spi reset -> ", cmd, WSPI_INIT_CMD_LEN);
}
void wl1271_spi_init(struct wl1271 *wl)
{
u8 crc[WSPI_INIT_CMD_CRC_LEN], *cmd;
struct spi_transfer t;
struct spi_message m;
cmd = kzalloc(WSPI_INIT_CMD_LEN, GFP_KERNEL);
if (!cmd) {
wl1271_error("could not allocate cmd for spi init");
return;
}
memset(crc, 0, sizeof(crc));
memset(&t, 0, sizeof(t));
spi_message_init(&m);
/*
* Set WSPI_INIT_COMMAND
* the data is being send from the MSB to LSB
*/
cmd[2] = 0xff;
cmd[3] = 0xff;
cmd[1] = WSPI_INIT_CMD_START | WSPI_INIT_CMD_TX;
cmd[0] = 0;
cmd[7] = 0;
cmd[6] |= HW_ACCESS_WSPI_INIT_CMD_MASK << 3;
cmd[6] |= HW_ACCESS_WSPI_FIXED_BUSY_LEN & WSPI_INIT_CMD_FIXEDBUSY_LEN;
if (HW_ACCESS_WSPI_FIXED_BUSY_LEN == 0)
cmd[5] |= WSPI_INIT_CMD_DIS_FIXEDBUSY;
else
cmd[5] |= WSPI_INIT_CMD_EN_FIXEDBUSY;
cmd[5] |= WSPI_INIT_CMD_IOD | WSPI_INIT_CMD_IP | WSPI_INIT_CMD_CS
| WSPI_INIT_CMD_WSPI | WSPI_INIT_CMD_WS;
crc[0] = cmd[1];
crc[1] = cmd[0];
crc[2] = cmd[7];
crc[3] = cmd[6];
crc[4] = cmd[5];
cmd[4] |= crc7(0, crc, WSPI_INIT_CMD_CRC_LEN) << 1;
cmd[4] |= WSPI_INIT_CMD_END;
t.tx_buf = cmd;
t.len = WSPI_INIT_CMD_LEN;
spi_message_add_tail(&t, &m);
spi_sync(wl->spi, &m);
wl1271_dump(DEBUG_SPI, "spi init -> ", cmd, WSPI_INIT_CMD_LEN);
}
/* Set the SPI partitions to access the chip addresses
*
* There are two VIRTUAL (SPI) partitions (the memory partition and the
* registers partition), which are mapped to two different areas of the
* PHYSICAL (hardware) memory. This function also makes other checks to
* ensure that the partitions are not overlapping. In the diagram below, the
* memory partition comes before the register partition, but the opposite is
* also supported.
*
* PHYSICAL address
* space
*
* | |
* ...+----+--> mem_start
* VIRTUAL address ... | |
* space ... | | [PART_0]
* ... | |
* 0x00000000 <--+----+... ...+----+--> mem_start + mem_size
* | | ... | |
* |MEM | ... | |
* | | ... | |
* part_size <--+----+... | | {unused area)
* | | ... | |
* |REG | ... | |
* part_size | | ... | |
* + <--+----+... ...+----+--> reg_start
* reg_size ... | |
* ... | | [PART_1]
* ... | |
* ...+----+--> reg_start + reg_size
* | |
*
*/
int wl1271_set_partition(struct wl1271 *wl,
u32 mem_start, u32 mem_size,
u32 reg_start, u32 reg_size)
{
struct wl1271_partition *partition;
struct spi_transfer t;
struct spi_message m;
size_t len, cmd_len;
u32 *cmd;
int addr;
cmd_len = sizeof(u32) + 2 * sizeof(struct wl1271_partition);
cmd = kzalloc(cmd_len, GFP_KERNEL);
if (!cmd)
return -ENOMEM;
spi_message_init(&m);
memset(&t, 0, sizeof(t));
partition = (struct wl1271_partition *) (cmd + 1);
addr = HW_ACCESS_PART0_SIZE_ADDR;
len = 2 * sizeof(struct wl1271_partition);
*cmd |= WSPI_CMD_WRITE;
*cmd |= (len << WSPI_CMD_BYTE_LENGTH_OFFSET) & WSPI_CMD_BYTE_LENGTH;
*cmd |= addr & WSPI_CMD_BYTE_ADDR;
wl1271_debug(DEBUG_SPI, "mem_start %08X mem_size %08X",
mem_start, mem_size);
wl1271_debug(DEBUG_SPI, "reg_start %08X reg_size %08X",
reg_start, reg_size);
/* Make sure that the two partitions together don't exceed the
* address range */
if ((mem_size + reg_size) > HW_ACCESS_MEMORY_MAX_RANGE) {
wl1271_debug(DEBUG_SPI, "Total size exceeds maximum virtual"
" address range. Truncating partition[0].");
mem_size = HW_ACCESS_MEMORY_MAX_RANGE - reg_size;
wl1271_debug(DEBUG_SPI, "mem_start %08X mem_size %08X",
mem_start, mem_size);
wl1271_debug(DEBUG_SPI, "reg_start %08X reg_size %08X",
reg_start, reg_size);
}
if ((mem_start < reg_start) &&
((mem_start + mem_size) > reg_start)) {
/* Guarantee that the memory partition doesn't overlap the
* registers partition */
wl1271_debug(DEBUG_SPI, "End of partition[0] is "
"overlapping partition[1]. Adjusted.");
mem_size = reg_start - mem_start;
wl1271_debug(DEBUG_SPI, "mem_start %08X mem_size %08X",
mem_start, mem_size);
wl1271_debug(DEBUG_SPI, "reg_start %08X reg_size %08X",
reg_start, reg_size);
} else if ((reg_start < mem_start) &&
((reg_start + reg_size) > mem_start)) {
/* Guarantee that the register partition doesn't overlap the
* memory partition */
wl1271_debug(DEBUG_SPI, "End of partition[1] is"
" overlapping partition[0]. Adjusted.");
reg_size = mem_start - reg_start;
wl1271_debug(DEBUG_SPI, "mem_start %08X mem_size %08X",
mem_start, mem_size);
wl1271_debug(DEBUG_SPI, "reg_start %08X reg_size %08X",
reg_start, reg_size);
}
partition[0].start = mem_start;
partition[0].size = mem_size;
partition[1].start = reg_start;
partition[1].size = reg_size;
wl->physical_mem_addr = mem_start;
wl->physical_reg_addr = reg_start;
wl->virtual_mem_addr = 0;
wl->virtual_reg_addr = mem_size;
t.tx_buf = cmd;
t.len = cmd_len;
spi_message_add_tail(&t, &m);
spi_sync(wl->spi, &m);
kfree(cmd);
return 0;
}
void wl1271_spi_read(struct wl1271 *wl, int addr, void *buf,
size_t len, bool fixed)
{
struct spi_transfer t[3];
struct spi_message m;
u8 *busy_buf;
u32 *cmd;
cmd = &wl->buffer_cmd;
busy_buf = wl->buffer_busyword;
*cmd = 0;
*cmd |= WSPI_CMD_READ;
*cmd |= (len << WSPI_CMD_BYTE_LENGTH_OFFSET) & WSPI_CMD_BYTE_LENGTH;
*cmd |= addr & WSPI_CMD_BYTE_ADDR;
if (fixed)
*cmd |= WSPI_CMD_FIXED;
spi_message_init(&m);
memset(t, 0, sizeof(t));
t[0].tx_buf = cmd;
t[0].len = 4;
spi_message_add_tail(&t[0], &m);
/* Busy and non busy words read */
t[1].rx_buf = busy_buf;
t[1].len = WL1271_BUSY_WORD_LEN;
spi_message_add_tail(&t[1], &m);
t[2].rx_buf = buf;
t[2].len = len;
spi_message_add_tail(&t[2], &m);
spi_sync(wl->spi, &m);
/* FIXME: check busy words */
wl1271_dump(DEBUG_SPI, "spi_read cmd -> ", cmd, sizeof(*cmd));
wl1271_dump(DEBUG_SPI, "spi_read buf <- ", buf, len);
}
void wl1271_spi_write(struct wl1271 *wl, int addr, void *buf,
size_t len, bool fixed)
{
struct spi_transfer t[2];
struct spi_message m;
u32 *cmd;
cmd = &wl->buffer_cmd;
*cmd = 0;
*cmd |= WSPI_CMD_WRITE;
*cmd |= (len << WSPI_CMD_BYTE_LENGTH_OFFSET) & WSPI_CMD_BYTE_LENGTH;
*cmd |= addr & WSPI_CMD_BYTE_ADDR;
if (fixed)
*cmd |= WSPI_CMD_FIXED;
spi_message_init(&m);
memset(t, 0, sizeof(t));
t[0].tx_buf = cmd;
t[0].len = sizeof(*cmd);
spi_message_add_tail(&t[0], &m);
t[1].tx_buf = buf;
t[1].len = len;
spi_message_add_tail(&t[1], &m);
spi_sync(wl->spi, &m);
wl1271_dump(DEBUG_SPI, "spi_write cmd -> ", cmd, sizeof(*cmd));
wl1271_dump(DEBUG_SPI, "spi_write buf -> ", buf, len);
}
void wl1271_spi_mem_read(struct wl1271 *wl, int addr, void *buf,
size_t len)
{
int physical;
physical = wl1271_translate_mem_addr(wl, addr);
wl1271_spi_read(wl, physical, buf, len, false);
}
void wl1271_spi_mem_write(struct wl1271 *wl, int addr, void *buf,
size_t len)
{
int physical;
physical = wl1271_translate_mem_addr(wl, addr);
wl1271_spi_write(wl, physical, buf, len, false);
}
void wl1271_spi_reg_read(struct wl1271 *wl, int addr, void *buf, size_t len,
bool fixed)
{
int physical;
physical = wl1271_translate_reg_addr(wl, addr);
wl1271_spi_read(wl, physical, buf, len, fixed);
}
void wl1271_spi_reg_write(struct wl1271 *wl, int addr, void *buf, size_t len,
bool fixed)
{
int physical;
physical = wl1271_translate_reg_addr(wl, addr);
wl1271_spi_write(wl, physical, buf, len, fixed);
}
u32 wl1271_mem_read32(struct wl1271 *wl, int addr)
{
return wl1271_read32(wl, wl1271_translate_mem_addr(wl, addr));
}
void wl1271_mem_write32(struct wl1271 *wl, int addr, u32 val)
{
wl1271_write32(wl, wl1271_translate_mem_addr(wl, addr), val);
}
u32 wl1271_reg_read32(struct wl1271 *wl, int addr)
{
return wl1271_read32(wl, wl1271_translate_reg_addr(wl, addr));
}
void wl1271_reg_write32(struct wl1271 *wl, int addr, u32 val)
{
wl1271_write32(wl, wl1271_translate_reg_addr(wl, addr), val);
}
